CO2 laser for warts: what to know

Warts are caused by a viral infection in the outer skin. Their appearance can overlap with other growths, so a clinician should examine an unusual, bleeding, painful or changing lesion before treatment. CO2 laser energy removes selected layers and may be considered when a wart is difficult to treat, returns, or sits where another method is unsuitable.

The treated site can be tender, red, swollen or crusted. Healing depends on the location and depth treated. A wart can recur because virus-infected cells may remain in nearby skin. Scarring and temporary or longer-lasting pigment change are possible, particularly after deeper treatment or in darker skin.

Tell the clinician about immune problems, diabetes, medicines, pregnancy, previous poor healing and any history of raised scars. Mention cold sores if the treatment area is near the mouth. Do not shave, pick or self-treat the lesion immediately before the appointment unless instructed.

After treatment, keep the wound clean and covered as directed. Wash hands before touching it, avoid picking the crust, and do not share towels, razors or nail tools. Limit friction and swimming until the surface has closed. Use sun protection after healing to reduce persistent darkening, and attend the planned review.

Contact the clinic if pain, redness, warmth or swelling is worsening, or if pus-like drainage, a spreading rash or fever appears. Seek prompt assessment for uncontrolled bleeding, severe pain, numbness that is increasing, or a lesion that changes, bleeds repeatedly or fails to heal. These symptoms may need examination rather than another self-treatment.

Ask whether the lesion is definitely a wart, why laser is being recommended, and what alternatives fit its site. Ask how deep the treatment will be, how long dressings are needed, how recurrence will be checked, and which activities or products to avoid while the wound heals.